package com.tudouji.framework.config;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import java.io.IOException;
import java.security.SecureRandom;

public class EncrypAES {
    private final static String DES = "DES";
    private final static String ENCODE = "GBK";
    private final static String defaultKey = "coalsupplychainplatform";

    /*** 使用 默认key 加密
     *@paramdata 待加密数据
     *@return*@throwsException*/

    public static String encrypt(String data){
        byte[] bt = new byte[0];
        try {
            bt = encrypt(data.getBytes(ENCODE), defaultKey.getBytes(ENCODE));
        } catch (Exception e) {
            e.printStackTrace();
        }

        String strs = new BASE64Encoder().encode(bt);
        return strs;

    }

    /*** 使用 默认key 解密
     *@paramdata 待解密数据
     *@return*@throwsIOException
     *@throwsException*/

    public static String decrypt(String data){
        if (data == null) return null;

        BASE64Decoder decoder = new BASE64Decoder();
        byte[] buf = new byte[0];
        try {
            buf = decoder.decodeBuffer(data);
            byte[] bt = decrypt(buf, defaultKey.getBytes(ENCODE));
            return new String(bt, ENCODE);
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /*** Description 根据键值进行加密
     *@paramdata 待加密数据
     *@paramkey 密钥
     *@return*@throwsException*/

    public static String encrypt(String data, String key) throws Exception {
        byte[] bt = encrypt(data.getBytes(ENCODE), key.getBytes(ENCODE));

        String strs = new BASE64Encoder().encode(bt);
        return strs;

    }

    /*** 根据键值进行解密
     *@paramdata 待解密数据
     *@paramkey 密钥
     *@return*@throwsIOException
     *@throwsException*/

    public static String decrypt(String data, String key) throws Exception {
        if (data == null) return null;

        BASE64Decoder decoder = new BASE64Decoder();
        byte[] buf = decoder.decodeBuffer(data);
        byte[] bt = decrypt(buf, key.getBytes(ENCODE));
        return new String(bt, ENCODE);

    }

    /*** Description 根据键值进行加密
     *
     *@paramdata
     *@paramkey

     * 加密键byte数组
     *@return*@throwsException*/

    private static byte[] encrypt(byte[] data, byte[] key) throws Exception {//生成一个可信任的随机数源

        SecureRandom sr = new SecureRandom();//从原始密钥数据创建DESKeySpec对象

        DESKeySpec dks = new DESKeySpec(key);//创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象

        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);

        SecretKey securekey = keyFactory.generateSecret(dks);//Cipher对象实际完成加密操作

        Cipher cipher = Cipher.getInstance(DES);//用密钥初始化Cipher对象

        cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);
        return cipher.doFinal(data);

    }

    /*** Description 根据键值进行解密
     *
     *@paramdata
     *@paramkey 加密键byte数组
     *@return*@throwsException*/

    private static byte[] decrypt(byte[] data, byte[] key) throws Exception {//生成一个可信任的随机数源

        SecureRandom sr = new SecureRandom();//从原始密钥数据创建DESKeySpec对象

        DESKeySpec dks = new DESKeySpec(key);//创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象

        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);

        SecretKey securekey = keyFactory.generateSecret(dks);//Cipher对象实际完成解密操作

        Cipher cipher = Cipher.getInstance(DES);//用密钥初始化Cipher对象

        cipher.init(Cipher.DECRYPT_MODE, securekey, sr);
        return cipher.doFinal(data);

    }

    public static void main(String[] args) {
        String data = "111111";
        String key = "coalsupplychainplatform";
        System.out.println("加密前===>" + data);
        try {
            System.err.println(encrypt(data, key));
            System.err.println(decrypt(encrypt(data, key), key));
            String jiamihou = encrypt(data);
            System.out.println("加密后===>" + jiamihou);
            System.out.println("解密后===>" + decrypt("0DXA0iCF19c="));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
